not to be rude, but there are a couple threads on what muffler sounds best for the 4.0..honestly its all personal preference...i "hear" the dynomax gives you a 5hp gain, vs other.. i own a flowmaster...love it..

Yeah...There are ways to try and get closer to a true dual. I think that a muffler swap is the cheapest / easiest route for 95% of cases. A forced induction application need some more thought. And full header back builds kind of negate the cost benefits of a simple muffler swap...but toher wise. It's a pretty solid option imho.

Yeah...There are ways to try and get closer to a true dual. I think that a muffler swap is the cheapest / easiest route for 95% of cases. A forced induction application need some more thought. And full header back builds kind of negate the cost benefits of a simple muffler swap...but toher wise. It's a pretty solid option imho.